Re: Ahhh, my head!!
If she is not in pain when she spits up, then there is no reason for concern.
My son literally spewed spit up. I had to use a receiving blanket as a burp cloth because the spit up would go everywhere, and I still ended up with spit up at the bottom of my pant legs and on my shoes. But he was fine. He gained extremely well, he was alert, happy, healthy, and meeting milestones. It affected me (constantly smelling of vomit and accumulating piles of laundry daily), but didn't affect my son at all.
If she seems to be in pain or if there are issues with weight gain, then you might want to discuss the possibility of reflux with your doctor.
There is absolutely no reason to limit time at the breast. Our pediatrician would tell me "you cannot overfeed a breastfed baby" at every one of our well baby visits.
K. Sophia - Mama to my little lactivore, the amazing Mr. X (11/10).